If you need to reset your Quicken account, I'd suggest getting in touch with them. They have the tools to check and help you start over your account. You may use this link for your reference: Quicken support.
If you need to start over with your QuickBooks Online (QBO) account, we can purge your account to start over. However, this process will only take effect if the QBO age is less than 60 days. Here's how:
Log in to your QuickBooks Online account as an admin.
Change the URL in your browser's address bar. For example: